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Finding the Fourth Proportional to 405.85, 560.03 and 228.80

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Solution

The fourth proportional to 405.85, 560.03 and 228.80 is: 315.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.85 : 560.03 = 228.80 : x
  2. Step 2: Convert to fraction form
    405.85/560.03 = 228.80/x
  3. Step 3: Cross multiply
    405.85x = 560.03 × 228.80
  4. Step 4: Simplify right side
    405.85x = 128,133.72
  5. Step 5: Solve for x
    x = 128,133.72/405.85
  6. Step 6: Final answer
    x = 315.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.